JP3027338B2 - Flow switching device for high and low pressure gas in air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow switching device for high- and low-pressure refrigerant gas in a cooling and heating device.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 61-6468 shows a typical example of a reversing switching valve for the above-mentioned refrigerant high / low pressure path in a conventional cooling / heating device.

In this switching valve, as shown in FIG. 6, a high-pressure gas inlet 2 for connecting to a discharge port of a compressor 10 is provided on the side wall of an airtight outer tube 1 so that the inside of the outer tube 1 is always filled with high-pressure gas. The condenser (indoor coil 11a, outdoor coil 11
b, first and second high and low pressure gas outlets 3, 4
And a low-pressure gas discharge port 5 connected to the suction port of the compressor 10 are arranged side by side. A slide block 6 serving as a flow path switching valve is provided, and the first and second high and low pressure gas outlet ports 3 are formed by sliding the slide block 6 left and right.
The direction of the refrigerant gas passing from the compressor 10 to the condensers 11a and 11b is switched so that either one of the compressors 4 and the low-pressure gas outlet 5 are communicated via the slide block 6.

A valve seat 11 is provided on the inner curved surface of the outer tube 1 so that the slide block 6 can slide linearly on the flat surface of the valve seat. Is applied to the surface of the valve seat 11 to ensure airtightness. In the conventional example, a pair of left and right pistons 7 and 8 connected to the slide block 6 are provided in the outer tube 1 as means for driving the slide block 6, and gas sucked and discharged into the compressor 10 via the switching valve. A pilot valve 9 is provided for driving the pistons 7 and 8 using a difference in pressure between the refrigerant (coolant).

[0005]

However, in the above-mentioned switching valve, since the slide block 6 for switching the passage is of a one-sided slide type, it is difficult to secure the close contact on the sliding surface, and there is a problem of a seal defect. Is inherent.

In addition, since the sliding block 6 has a structure in which linear sliding is performed while always applying a high pressure from the high-pressure gas inlet 2 to a relatively large sliding surface of the sliding block 6, the sliding resistance on the sliding surface becomes excessive. This hinders smooth sliding of the slide block 6 and causes deterioration of responsiveness at the time of switching,
Further, there is a problem that abrasion easily occurs due to repeated sliding under a high pressure, and the above-mentioned seal defect is promoted.

In the conventional example, in order to address the above structural problem,
Various efforts have been made in the design specifications such as the installation of the slide block sliding valve seat 11 on the inner curved surface of the outer tube 1, the selection of the materials for the slide blocks 6 and 11, and the processing technology.

In the prior art, a pair of left and right pistons 7 and 8 connected to the slide block 6 are provided in the outer tube 1 as means for driving the slide block 6, and the piston 10 is connected to the compressor 10 via the switching valve. The structure is complicated, such as installation of a pilot valve 9 for driving the pistons 7 and 8 using the difference in high and low pressures of the gas (refrigerant) to be sucked and discharged, and the piping thereof is required. It has a problem and a problem that leads to an increase in cost.

[0009]

SUMMARY OF THE INVENTION A high-low pressure gas flow switching device in a cooling and heating apparatus according to the present invention comprises a hermetic housing and a flow which is rotated forward and backward at a constant rotation angle about an axis in the hermetic housing. A road switching rotor.

A first switching path having an open end on one of the first end faces facing the rotor in the axial direction, and a second switching path.
The switching paths are arranged side by side on a circular locus about the axis, and a third switching path having an open end provided on the other second end face is provided.

The third switching path is communicated with the first switching path and the second switching path in the rotor.

On the other hand, a first connection port connected to a high-pressure gas discharge port of the compressor is provided on a first end wall of the housing facing the first end face of the rotor. The first connection port is the first
The outer end passing through the end wall is provided for connection to the compressor, and the inner end is provided for selective switching between the first and second switching paths via the sealing on the inner surface of the first end wall.

That is, the first connection port is selectively communicated via a sealing with one of the first and second switching paths which rotate forward and backward with the forward and reverse rotation of the rotor, and the other is the first end wall. It is arranged so that it may be intimately closed through the ceiling with the inner surface of the vehicle.

Further, a second connection port and a third connection port, which are respectively connected to one end and the other end of the condenser, are formed on a second end wall of the housing facing the second end face of the rotor on a circular locus about the axis. Side by side.

The second and third connection ports pass through the second end wall, the outer end thereof is provided for connection with the condenser, and the inner end thereof is selectively opened on the inner surface of the second end wall; It is arranged so as to be selectively switched to the third switching path via a ceiling. That is, one of the second and third connection ports is selectively communicated via the ceiling with the third switching path which rotates forward and reverse with the forward and reverse rotation of the rotor, and the other is selectively inserted into the housing. It is arranged to be open.

Further, the second end wall is provided with a fourth connection port which is opened in the housing and is connected to the low pressure gas suction port of the compressor.

The fourth connection port penetrates through the second end wall, an outer end thereof is provided for connection with the condenser, and an inner end forms an open end which is opened at an end face of the second end wall.

The low-pressure gas from the condenser introduced into the housing through one of the second and third connection ports is supplied to the low-pressure gas suction port of the compressor through the fourth connection port. The high-pressure gas discharged from the high-pressure gas discharge port of the compressor flows into a communication path formed by any one of the first and second switching paths and the third switching path that can communicate with each other through the sealing through the first connection port, The high-pressure gas discharged from the third switching path is supplied to the condenser through one of the second and third connection ports that are communicated via a sealing, and the low-pressure gas from the condenser is supplied to the second and third connection ports. And then fills the housing and supplies it to the compressor through the fourth connection port.

By the above, the disadvantage of the conventional example caused by filling the inside of the housing with the high-pressure gas is drastically solved.
The intended purpose of switching the flow path can be appropriately achieved by the constant rotation of the rotor. In addition, the structure in which a high pressure is supplied from the first end face of the rotor and discharged from the second end face minimizes an upward and downward pressure difference as much as possible, thereby effectively reducing an uneven load applied to the rotor.

The first to third switching paths are bored in parallel with the axis. The third switching path has a center between the first and second switching paths and the first and second switching paths. The diameter of the first and second switching paths is made larger than the diameter of the first and second switching paths so as to communicate with the diameter ends of the third switching paths, respectively. To facilitate. Further, the sum of the opening areas of the first switching path and the second switching path is made substantially equal to the opening area of the third switching path, and the pressure acting upward and downward is balanced to reduce the unbalanced load which causes the inclination of the rotor. Effectively prevent.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.
It will be described based on. Note that the component codes are used irrespective of FIG.

A high-low pressure gas flow switching device in a cooling and heating device according to the present invention comprises an airtight housing 1 and a flow switching rotor 3 which is rotated forward and backward at a constant rotation angle about a shaft 2 in the airtight housing 1. And

The airtight housing 1 is formed of a cylindrical body,
The above-mentioned rotor 3 is made of a short and small cylindrical body, and is made of iron, copper,
It is made of metal such as aluminum. Alternatively, one or both of the both 1, 3 are formed of a synthetic resin.

A small gap 4 is formed between the housing 1 and the rotor 3 over the entire circumference, and this gap is filled with a low-pressure gas described later.

A first switching path 6 having an open end on one of the first end faces 5 opposed to the rotor 3 in the axial direction.
And a second switching path 7 arranged side by side on a circular locus about the shaft 2, and a third switching path 8 having an open end provided on the other second end face 9. 8 is the first switching path 6
And the second switching path 7 is communicated within the rotor. The first to third switching paths 6, 7, 8 are bored in parallel with the axis, and the third switching path 8 is formed by the first switching path 6 and the second switching path 7.
, And has a larger diameter than the first and second switching paths, and the diameter ends of the first and second switching paths 6 and 7 are at the diameter ends of the third switching path 8 respectively. The first and third switching paths are bored and communicated with each other easily.

That is, the rotor 3 is formed of a solid metal block, and the first and second rotors 3 are formed from the first end face thereof using a cutting tool.
The switching paths 6 and 7 are bored, and the third switching path is similarly processed from the second end face 9 so as to communicate with each other at the block intermediate portion. Reference numeral 10 denotes a communication port.

A cylindrical sealing 11 is closely fitted on the inner peripheral surface of the end of each of the above-mentioned switching paths 6, 7, 8 and the inner surface thereof is formed on the inner surface of the first end wall 12 and the second end wall 13 of the hermetic housing. Close air tightness. On the other hand, a first connection port 15 connected to a high-pressure gas discharge port of a compressor 14 is provided on the first end wall 12 of the housing 1 facing the first end face 5 of the rotor 3.

The first connection port 15 penetrates through the first end wall 12 and an outer end is provided for connection with the compressor 14, and an inner end is formed on the inner surface of the first end wall by the first and second switching paths 6. ,
7 for selective switching.

That is, the first connection port 15 is connected to the rotor 3
Is selectively communicated via the ceiling 11 with either one of the first and second switching paths 6 and 7 that rotate forward and reverse along with the forward and reverse rotation of the high-pressure gas, and the other switching paths 7 and 6 The inner surface of the first end wall is brought into close contact with the inner surface of the first end wall via the sealing 11 to be in a closed state.

Further, a second connection port 17 and a third connection port 18 which are respectively connected to one end and the other end of the condenser 16 are connected to the second end wall 13 of the housing 1 facing the second end face 9 of the rotor 3 by the shaft. They are arranged side by side on a circular locus centered at 2.

The second and third connection ports 17 and 18 penetrate through the second end wall 13, the outer end thereof is connected to the condenser 16, and the inner end thereof is formed on the inner surface of the second end wall 13. It is arranged to be selectively opened and selectively communicated with the third switching path via the ceiling 11.

That is, one of the second and third connection ports 17 and 18 is selectively communicated via the ceiling 11 with the third switching path 8 which rotates forward and reverse with the forward and reverse rotation of the rotor 3. And the other is selectively opened into the housing 1.

Further, the second end wall 13 is provided with a fourth connection port 19 opened into the housing 1 and connected to the low-pressure gas suction port of the compressor 14. The fourth connection port 19 penetrates the second end wall 13, an outer end thereof is provided for connection with the condenser 16, and an inner end forms an open end which is opened on an inner surface of the second end wall 13. .

As shown in FIGS. 1A and 1B, when the rotor 3 is turned forward, the low-pressure gas from the condenser 16 introduced into the gap 4 in the housing 1 through the second connection port 17 is discharged. The air is supplied to the low-pressure gas suction port of the compressor 14 through the four connection ports 19.

The high-pressure gas compressed by the compressor 14 and discharged from the high-pressure gas discharge port is supplied to the first connection port 1.
5 flows into the communication path formed by the first switching path 6 and the third switching path 8 communicated via the sealing 11 through the sealing 11, and the high-pressure gas discharged from the third switching path 8 is communicated via the sealing 11. The condenser 1 through the connection port 18
The low pressure gas from the condenser 16 is supplied to the gap 4 in the housing 1 through the second connection port 17 to fill the housing 1 and supply the same to the compressor 14 through the fourth connection port 19.

The heating state is formed as described above.

Next, when the rotor is rotated backward as shown in FIGS. 2A and 2B, the low-pressure gas from the condenser 16 introduced into the gap 4 in the housing 1 through the third connection port 18 is supplied to the fourth connection port. The air is supplied to the low-pressure gas inlet of the compressor 14 through 19.

Further, the high-pressure gas compressed by the compressor 14 and discharged from the high-pressure gas discharge port is supplied to the first connection port 1.
5 flows into a communication path formed by the second switching path 7 and the third switching path 8 which are communicated through the sealing 11 through the sealing 11, and the high-pressure gas discharged from the third switching path 8 is communicated through the sealing 11. The condenser 1 through the connection port 17
6 and the low-pressure gas from the condenser 16 is supplied to a third
The air is supplied to the gap 4 in the housing 1 through the connection port 18 to fill the inside of the housing 1 and is supplied to the compressor 14 through the fourth connection port 19.

Thus, a cooling state is formed.

The above-mentioned rotor can be formed by boring a solid metal block, or it can be formed by casting or forging to give an outer shape to each of the above-mentioned switching paths. Alternatively, each switching path can be formed while sintering the metal powder to form the outer shape of the rotor. In the case of molding the rotor with resin, injection molding is suitable.

[0041]

As described above, according to the present invention, the interior of the housing is always filled with the low-pressure gas, and the rotor can be smoothly rotated and switched. And the intended purpose of switching the flow path can be properly achieved by the constant rotation of the rotor.

In addition, a high pressure is supplied from the first end face of the rotor via the first switching path and discharged from the second end face via the second and third switching paths, whereby an upward and downward pressure difference along the axis is reduced. As much as possible, the offset load applied to the rotor can be effectively reduced. Therefore, it is possible to prevent the rotor from tilting and effectively prevent airtight shrinkage.

Also, by making the total sum of the opening areas of the first switching path and the second switching path substantially equal to the opening area of the third switching path,
The pressure acting in the upward and downward directions is balanced to more effectively prevent the above-mentioned eccentric load that causes the inclination of the rotor.

The first to third switching paths are bored in parallel with the axis. The third switching path has a center between the first and second switching paths and the first and second switching paths. The diameter of the first and second switching paths is made larger than that of the first and second switching paths, and the bore ends and the communication processing of the first to third switching paths are extremely reduced. Can be easier.

[Brief description of the drawings]

1A is a cross-sectional view of the switching device showing a heating cycle, taken along the line II in FIG. 3, and FIG. 1B is a longitudinal sectional view of the switching device.

2A is a sectional view of the switching device showing a cooling cycle, taken along the line II in FIG. 3, and FIG. 2B is a longitudinal sectional view of the A switching device.

FIG. 3 is a sectional view taken along line III-III in FIG. 5A.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 5A.

FIG. 5A is a cross-sectional view of the switching device, and FIG. 5B is a perspective view showing the rotor with a part cut away.

FIG. 6 is a cross-sectional view of a high-low pressure gas flow switching device in a conventional cooling and heating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hermetic housing 2 Shaft 3 Rotor 4 Gap 5 First end face 6 First switching path 7 Second switching path 8 Third switching path 9 Second end face 10 Communication port 11 Sealing 12 First end wall 13 Second end wall 14 Compressor 15 First connection port 16 Condenser 17 Second connection port 18 Third connection port 19 Fourth connection port

Claims (3)

(57) [Claims] An airtight housing, and a flow path switching rotor that is rotated forward and backward at a constant rotation angle about an axis in the airtight housing, and one of the first end faces opposed to the rotor in the axial direction. A first switching path and a second switching path, each having an open end, are arranged side by side on a circular locus about the axis.
A third switching path having an open end provided on the other second end face is provided, and the third switching path is communicated with the first switching path and the second switching path in the rotor, while the first end face of the rotor is provided. A first connection port connected to a high-pressure gas discharge port of a compressor is provided on a first end wall of the housing facing the first port;
The connection port is selectively communicated via a sealing with one of the first and second switching paths that rotate forward and backward with the forward and reverse rotation of the rotor, and the other is connected to the inner surface of the first end wall. A second connection port and a third connection port, which are disposed so as to be tightly closed via a sealing, and are respectively connected to one end and the other end of a condenser on a second end wall of the housing facing the second end face of the rotor. Are arranged side by side on a circular locus about the axis, and the second and third connection ports are connected to the third switching path, in which one of the second and third connection ports rotates forward and reverse with the forward and reverse rotation of the rotor. A second end wall that is selectively communicated with the compressor and the other end is selectively opened into the housing, and that is opened into the housing at the second end wall and connected to a low-pressure gas inlet of the compressor. Four connection ports are provided, and the second and third A low-pressure gas from a condenser introduced into the housing is supplied to the low-pressure gas suction port of the compressor through the fourth connection port through one of the connection ports, and discharged from a high-pressure gas discharge port of the compressor. The first and the second connected to the high-pressure gas through the first connection port through the sealing.
Either one of the second and third connection ports, which flows into a communication path formed by one of the switching paths and the third switching path and communicates the high-pressure gas discharged from the third switching path via the sealing. A high-low pressure gas flow switching device in the cooling and heating device, wherein the high-pressure gas and the low-pressure gas are supplied to the condenser through a condenser. 2. A hermetic housing, and a flow path switching rotor that is rotated forward and backward at a constant rotation angle about an axis in the hermetic housing, and one first end face facing the rotor in the axial direction. A first switching path and a second switching path, each having an open end, are arranged side by side on a circular locus about the axis.
A third switching path having an open end disposed on the other second end face is provided, and the first to third switching paths are bored in parallel with the axis,
The third switching path has a center in the middle between the first switching path and the second switching path, has a larger diameter than the first and second switching paths, and connects the third switching path to the first switching path. A first connection port connected to a high-pressure gas discharge port of a compressor is provided on a first end wall of a housing opposed to a first end face of the rotor, the first connection port being connected to the second switching path in the rotor;
The connection port is disposed so as to be selectively communicated with any one of the first and second switching paths that rotate forward and reverse with the forward and reverse rotation of the rotor, and further includes a second end face of the housing facing the second end face of the rotor. A second connection port and a third connection port, which are respectively connected to one end and the other end of the condenser, are arranged side by side on a circular locus centered on the axis. One of which is selectively communicated with the third switching path that rotates forward and reverse with the forward and reverse rotation of the rotor, and the other is disposed so as to be selectively opened into the housing.
A fourth connection port is provided on the end wall and is open in the housing and is connected to the low-pressure gas suction port of the compressor. A fourth connection port is provided from one of the second and third connection ports. A low-pressure gas is supplied to the low-pressure gas suction port of the compressor through the fourth connection port, and high-pressure gas discharged from the high-pressure gas discharge port of the compressor is switched between the first and second switching ports through the first connection port. A high-pressure gas that flows into a communication path formed by one of the paths and the third switching path, and is supplied from the third switching path to the condenser through one of the second and third connection ports. A flow switching device for high and low pressure gas in a cooling and heating device. 3. A hermetic housing, and a flow path switching rotor that is rotated forward and backward at a constant rotation angle about an axis in the hermetic housing, and one of the first end faces facing the rotor in the axial direction. A first switching path and a second switching path, each having an open end, are arranged side by side on a circular locus about the axis.
A third switching path having an open end provided on the other second end face is provided, and the sum of the opening areas of the first switching path and the second switching path is equal to the third switching path.
The third switching path is set to be substantially the same as the opening area of the switching path, and the third switching path communicates with the first switching path and the second switching path in the rotor, while the first end of the housing facing the first end face of the rotor. A first connection port connected to a high-pressure gas discharge port of the compressor is provided on the wall, and the first connection port is selected from one of a first and a second switching path that rotates forward and reverse with the forward and reverse rotation of the rotor. And a second connection port and a third connection port connected to one end and the other end of the condenser, respectively, on the second end wall of the housing facing the second end face of the rotor. The second and third connection ports are arranged in parallel on a circular locus having a center, and one of the second and third connection ports is selectively communicated with the third switching path that rotates forward and reverse with the forward and reverse rotation of the rotor. And the other is selectively opened into the housing. Further, a fourth connection port is provided in the second end wall and opened to the housing and connected to a low-pressure gas suction port of the compressor, and is introduced into the housing through one of the second and third connection ports. The low pressure gas from the condenser is supplied to the low pressure gas suction port of the compressor through the fourth connection port, and the high pressure gas discharged from the high pressure gas discharge port of the compressor is supplied to the first connection port through the first connection port. The high-pressure gas flowing into the communication path formed by one of the second switching path and the third switching path and discharged from the third switching path to the condenser through one of the second and third connection ports. A flow switching device for high and low pressure gas in a cooling and heating device, characterized in that it is configured to supply the gas.